Europe is set to enter the winter heating season with gas storage levels at their lowest for 13 years, raising concerns about higher prices and increased market volatility.

Axar.az reports, citing The Guardian, that EU gas reserves were 63% full in the final week of August, well below the recent average of 80% for this time of year.

Analysts warn that storage could remain about 20% below the five-year average when winter begins.

The UK could be particularly vulnerable because it is one of Europe’s biggest gas consumers but has limited domestic storage capacity. German storage facilities were about 50% full, while those in Belgium and the Netherlands stood at 51% and 45%, respectively.

Europe’s benchmark gas price has already risen above €68 per megawatt-hour, more than double its level at the start of the year. Goldman Sachs analysts warned that prices could need to exceed €100/MWh to attract enough LNG shipments if Middle Eastern gas exports do not resume.